38
Pump Overrun Timer
To change circuit board proceed as if to change Main
Thermostat 1 to 6 (page 37) then:
Disconnect the molex plug from the circuit board.
Remove the circuit board from the two supports.
Fit the new circuit board to the mounting plate and
reconnect the molex plug.
Reassemble all components in reverse order.
Remove Combustion Chamber Door
To change burner, burner injectors, gas valve and
insulation panels proceed as follows:
1
Turn off gas supply at the service tap and disconnect
the union.
2
Disconnect the electrical plug on the gas valve by
removing screw and pulling forward.
3
Disconnect the two wires from the overheat
thermostat.
4
Loosen the screw on the capillary
retaining washer, allowing the
washer to move freely. Release the
capillaries from the clips on the side
of the combustion box. Remove both
phials from the thermostat pocket.
5
Remove brass sealing plug with fibre washer.
6
Loosen the six screws sufficiently for the
removal of the combustion chamber door.
Remove the combustion chamber door
complete with the burner.
NOTE: When re-assembling, care must be taken to
align the overheat thermostat capillary with the groove
in the main thermostat phial.
3
1
4
5
6
2
Wiring removed
for clarity
